Changes

In addition, mines must be inspected for unstable conditions which might result in a cave-in, and other hazardous conditions.  Timber framing is installed inside underground mines, but contrary to popular misconception this is not to reinforce the mine and prevent collapse, as no timber framing can support the vast tonnage above the mine passage.  Rather, it is to warn of unstable conditions and an imminent collapse and give miners advance notice to escape.  If the timber framing breaks or starts making loud creaking noises, this is a warning that a cave-in is likely.

In addition, mines must be inspected for unstable conditions which might result in a cave-in, and other hazardous conditions.  Timber framing is installed inside underground mines, but contrary to popular misconception this is not to reinforce the mine and prevent collapse, as no timber framing can support the vast tonnage above the mine passage.  Rather, it is to warn of unstable conditions and an imminent collapse and give miners advance notice to escape.  If the timber framing breaks or starts making loud creaking noises, this is a warning that a cave-in is likely.

==Notes & References==

==References==

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